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                                    168 ISCAR PRE-THREAD DRILLING WITH CHAMFERING Explanation of Chamfering Ring Description Example:RING DCM 1001 21 DesignationRING DCM %u2014 chamfering ring mounted on CHAM-DRILL line drills2 Minimum Hole Diameter (DCN)DC Basic Dimensions of the Chamfering RingBD45%u02daLBCHWBD %u2014 body diameterLB %u2014 body lengthCHW %u2014 chamfer width

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